WO2020138346A1

WO2020138346A1 - Soft intraocular lens material and soft intraocular lens

Info

Publication number: WO2020138346A1
Application number: PCT/JP2019/051262
Authority: WO
Inventors: 隆廣夛田; 響子村瀬
Original assignee: 株式会社ニデック
Priority date: 2018-12-28
Filing date: 2019-12-26
Publication date: 2020-07-02
Also published as: JPWO2020138346A1; JP2022001320A; JP7336064B2; CN113195563A; JP6963739B2; EP3904408A1; EP3904408A4; CN113195563B; CN115975105A

Abstract

Provided are a soft intraocular lens material and a soft intraocular lens, which achieve flexibility and shape recoverability as well as reduction of glistening. The soft intraocular lens material is obtained through polymerization of polymerizable components having polymerizability, the polymerizable components including: an aromatic ring-containing methacrylate (A); an alkoxy group-containing acrylate (B); a hydroxy group-containing acrylate (C); and a cross-linkable (meth)acrylate (D). With respect to 100 parts by mass of the polymerizable components, the proportion of the alkoxy group-containing acrylate (B) is 30 parts by mass or more. The proportion of the aromatic ring-containing methacrylate (A) preferably 40-52 parts by mass. The proportion of the alkoxy group-containing acrylate (B) is preferably 35-46 parts by mass.

Description

Soft intraocular lens material and soft intraocular lens

The present invention relates to a soft intraocular lens material and a soft intraocular lens.
This application claims priority based on International Application PCT/JP2018/048610 filed December 28, 2018, the entire content of which is incorporated herein by reference.

As one of the treatment methods for cataract, conventionally, a method in which a cloudy white crystalline lens is removed from the lens capsule and an intraocular lens (IOL) that plays a role of refractive power instead of the crystalline lens is inserted into the capsule has been widely adopted. ing. The intraocular lens includes an optical section that exhibits a refractive power and a support section that fixes the position of the optical section inside the capsule. When inserting the intraocular lens, for example, prepare a one-piece intraocular lens in which the optical part and the support part are integrally molded, and use the insertion instrument called an injector to fold the intraocular lens. It is designed to be inserted into the eye. The inserted intraocular lens restores its original shape again in the capsule, and the support portion is pressed against the capsule to stabilize the position in the capsule. This intraocular lens is desired to have high flexibility and shape recovery in order to make the incision of the lens capsule as small as possible (see Patent Documents 1 to 3, for example).

International Publication No. 2018/021455 Japanese Patent Application Publication No. Heisei 11 56998 International Publication No. 2016/121804

As a constituent material of such a foldable soft intraocular lens, a soft resin made of silicone, hydrophobic (meth)acrylate, hydrophilic (meth)acrylate or the like is widely used. Among them, hydrophobic (meth)acrylates are widely used because there are few cases of post-cataract occurrence after surgery. Here, the hydrophobic (meth)acrylate is not well compatible with water, and a phenomenon called glistening, in which a small amount of water in the lens aggregates into dots and appears bright, tends to occur. Therefore, the combined use of a hydrophobic (meth)acrylate and a hydrophilic (meth)acrylate is indispensable for producing a soft intraocular lens material. However, the conventional soft intraocular lens material has room for improvement in compatibility between the above-mentioned flexibility and shape recoverability and reduction of glistening. There is also a potential demand for a variety of soft intraocular lens materials that can satisfy both of these requirements.

In view of the circumstances of the above-mentioned conventional technology, the present application aims to provide a new soft intraocular lens material that has both flexibility and shape recovery and reduction of glistening. From another point of view, this application aims at providing a soft intraocular lens using this soft intraocular lens material.

The soft intraocular lens material provided by the technique disclosed herein is obtained by polymerizing a polymerizable component having polymerizability, and the polymerizable component includes an aromatic ring-containing methacrylate (A) and an alkoxy group-containing acrylate (B). ), a hydroxy group-containing acrylate (C), and a crosslinkable (meth)acrylate (D). And when the said polymeric component is 100 mass parts, the said acrylate (B) containing an alkoxy group is 30 mass parts or more.

As a result of the detailed examination by the inventors of the conventional soft intraocular lens material, the following phenomenon was confirmed. That is, the conventional soft intraocular lens material is made to sufficiently contain the hydrophilic (meth)acrylate in order to suppress the occurrence of glistening. However, the hydrophilic (meth)acrylate can suppress the occurrence of glistening by creating an environment in which the aqueous humor does not easily aggregate in the voids of the polymer, but has the trade-off of increasing the hardness of the polymer. Further, when the hydrophilicity of the soft intraocular lens material is increased, moisture in the air is absorbed and the shape and physical properties of the lens are likely to change, which makes the handling of the intraocular lens difficult. Although there may be a monomer component capable of suppressing the occurrence of glistenings such as known polymethylmethacrylate (PMMA) in the hydrophobic (meth)acrylate, it can be obtained by using such a monomer component. The polymer obtained is a hard material that cannot be folded when the lens is constructed, and is difficult to use.

Therefore, as a result of intensive studies by the present inventors, by using a methacrylate monomer having an aromatic ring and an alkoxy acrylate having no aromatic ring in combination, flexibility and shape recoverability suitable for a soft intraocular lens material are obtained. (Hereinafter, it may be simply referred to as "physical property".) It was found that the effect of suppressing glistening is exhibited without impairing the physical properties, and a part of the function of the hydrophilic monomer can be substituted, and the present invention has been completed. .. However, in terms of ensuring sufficient flexibility, it is important that the alkoxy group-containing acrylate (B), which is softer than the methacrylate component, is contained in an amount of 30 parts by mass or more. This provides a soft intraocular lens material that has both flexibility and shape recoverability and reduced glistening.

In a preferred embodiment of the soft intraocular lens material disclosed herein, the aromatic ring-containing methacrylate (A) is 40 parts by mass or more and 52 parts by mass or less, when the polymerization component is 100 parts by mass. With such a configuration, it is possible to preferably suppress the occurrence of glistening without impairing the flexibility suitable for folding the soft intraocular lens material.

In a preferred embodiment of the soft intraocular lens material disclosed herein, the alkoxy group-containing acrylate (B) is 35 parts by mass or more and 46 parts by mass or less when the polymerization component is 100 parts by mass. With such a configuration, it is possible to favorably achieve both flexibility and shape recoverability and reduction of glistening.

In a preferred embodiment of the soft intraocular lens material disclosed herein, the hydroxy group-containing acrylate (C) is 8 parts by mass or more and 12 parts by mass or less when the polymerization component is 100 parts by mass. By suppressing the use of the hydrophilic acrylate in such a small amount, it is possible to better reduce the deterioration of the flexibility and shape recovery of the soft intraocular lens.

In a preferred embodiment of the soft intraocular lens material disclosed herein, the total amount of the aromatic ring-containing methacrylate (A) and the alkoxy group-containing acrylate (B) is 100 parts by mass of the polymerization component. , 75 parts by mass or more and 90 parts by mass or less. According to the soft intraocular lens material disclosed herein, a combination of an aromatic ring-containing methacrylate and a non-aromatic ring-containing alkoxyacrylate forms a polymer having a skeleton effective for reducing glistening. Conceivable. As a result, it is possible to reduce the glistening in a state where the content of the hard hydrophilic (meth)acrylate is suppressed, and it is possible to balance the physical characteristics and the reduction of the glistening at a high level.

In a preferred embodiment of the soft intraocular lens material disclosed herein, the aromatic ring-containing methacrylate (A) has the following general formula (1):

However, in the formula, R1 is a linear or branched alkylene group having 1 to 8 carbon atoms, and X indicates that the element is absent or is an oxygen atom; This makes it possible to enhance the above effects while realizing the high refractive index and flexibility of the soft intraocular lens material.

In one preferable embodiment of the soft intraocular lens material disclosed herein, the alkoxy group-containing acrylate (B) has the following general formula (2):

However, in the formula, R2 is a methyl group or an ethyl group, and n is an integer of 1 to 4; As a result, the above effect can be enhanced.

In a preferred embodiment of the soft intraocular lens material disclosed herein, the hydroxy group-containing acrylate (C) has the following general formula (3):

However, in the formula, R3 is a linear or branched alkylene group having 1 to 8 carbon atoms; As a result, the above effect can be enhanced.

In a preferred embodiment of the soft intraocular lens material disclosed herein, the above-mentioned polymerization component contains a monomer having an ultraviolet absorbing ability. Thereby, a soft intraocular lens that can reduce the risk of the occurrence of eye diseases caused by ultraviolet rays is provided.

In a preferred embodiment of the soft intraocular lens material disclosed herein, the above-mentioned polymerization component contains a monomer having a yellow coloring ability. As a result, it is possible to partially suppress the transmission of blue light and provide natural vision that is not unnatural to the vision of the crystalline lens.

The above soft intraocular lens materials have excellent flexibility and a glistening suppression effect. Such characteristics are particularly suitable for use as a material for forming a soft intraocular lens that is kept implanted in the eyeball and then immersed in aqueous humor for a long period of time. Therefore, in another aspect, the technology disclosed herein provides a soft intraocular lens manufactured using the soft intraocular lens material described in any of the above.

It is a (a) top view and a (b) side view which explain typically composition of a 1 piece type intraocular lens concerning one embodiment.

A preferred embodiment of the present invention will be described below. Incidentally, matters other than matters particularly referred to in the present specification (composition of the soft intraocular lens, etc.), and matters necessary for carrying out the present invention (basic form of the soft intraocular lens, etc.), A person skilled in the art can understand based on the teaching for carrying out the invention described in this specification and the common general knowledge as of the filing. The present invention can be carried out based on the contents disclosed in this specification and the common general technical knowledge in the field. Further, in the following drawings, members/sites having the same operation may be described with the same reference numerals, and redundant description may be omitted or simplified. Further, the notation “A to B” indicating a numerical range means “A or more and B or less” unless otherwise specified.

FIG. 1 is a diagram illustrating a configuration of a one-piece type soft intraocular lens according to an embodiment. 1A is a plan view and FIG. 1B is a side view. The soft intraocular lens 1 includes an optical section 10 having a predetermined refractive power, and a pair of support sections 20 for supporting the optical section 10 in the eye. The optical part 10 and the support part 20 are integrally molded from the same raw material resin composition.

The optical unit 10 has, for example, a circular shape having a diameter D of about 5.5 mm to 7 mm, typically about 6 mm in a plan view. The direction orthogonal to the diameter D direction of the optical unit 10 is called the thickness direction. Further, the optical unit 10 has a biconvex lens shape that protrudes toward both sides (both sides in the thickness direction) in a side view. The thickness of the optical unit 10 can be determined based on the refractive index of the material forming the optical unit 10, the desired refractive power required for the optical unit 10, and the like. The thickness of the optical part 10 may be, for example, 300 μm or more, and 400 μm or more, for example, at the center O of the circular optical part 10. Further, the thickness of the optical unit 10 is, for example, about 1000 μm or less, and may be, for example, 900 μm or less, for example, 700 μm or less, 600 μm or so (about ±10%). However, the shape of the optical unit 10 is not limited to this. The shape of the optical unit 10 may be, for example, an elliptical shape or a similar elliptical shape in a plan view. The shape of the optical unit 10 may be, for example, a plano-convex lens shape in which only one surface protrudes and the other surface is flat in a side view, or one surface protrudes and the other surface has a concave convex shape. It may have a meniscus lens shape or the like.

The support portion 20 is formed so as to project outward from the peripheral edge of the optical portion 10. The pair of support parts 20 are formed with respect to the optical part 10 so as to be point-symmetrical with the center O of the optical part 10 as an axis of symmetry. The support portion 20 has a loop shape with one end free. The supporting portion 20 includes, in the vicinity of the connecting portion with the optical portion 10, a bending portion 20a that is largely bent in the plane of the lens portion. The support portion 20 is configured to be further bendable in the bending portion 20a in a direction in which the free end portion approaches the center O. The distance L between the free ends of the pair of support portions 20 is, for example, about 11.5 mm to 13.5 mm, typically about 12 mm to 13 mm. However, the shape of the support portion 20 is not limited to this. The optical unit 10 and the support unit 20 may be made of the same material or may be made of different materials. In the soft intraocular lens 1 disclosed herein, for example, both the optical section 10 and the support section 20 may be made of the same soft intraocular lens material.

This soft intraocular lens material is composed by polymerizing a polymerizable component having polymerizability. The polymerization component for constituting the soft intraocular lens material is essentially an aromatic ring-containing methacrylate (A), an alkoxy group-containing acrylate (B), a hydroxy group-containing acrylate (C), and a crosslinkable (meth). ) Acrylate (D). In other words, the soft intraocular lens material corresponds to the monomer unit corresponding to the aromatic ring-containing methacrylate (A), the monomer unit corresponding to the alkoxy group-containing acrylate (B), and the hydroxy group-containing acrylate (C). It is composed of a (meth)acrylate copolymer containing a monomer unit and a monomer unit corresponding to the crosslinkable (meth)acrylate (D).

In addition, in this specification, the “(meth)acrylate copolymer” is a polymer which is generally called a so-called “acrylic polymer”, and includes a polymerizable unsaturated double bond in one molecular structure (meth). ) A polymer containing a monomer unit derived from a monomer having at least one acryloyl group (hereinafter sometimes referred to as a (meth)acrylate monomer). The (meth)acrylate copolymer typically has a total of 50% by mass or more (preferably 75% by mass or more, more preferably 80% by mass) of monomer units derived from a (meth)acrylate monomer in one molecular structure. % Or more, particularly preferably 90% by mass or more, for example 95% by mass or more). In addition, "(meth)acrylate" is a term that comprehensively means acrylate and methacrylate. Hereinafter, each polymerization component will be described.

The present inventors have found that the combined use of the aromatic ring-containing methacrylate (A) and the alkoxy group-containing acrylate (B) has an effect of achieving both a high level of appropriate physical properties and suppression of glistening. However, it is used as a main polymerization component. In other words, the aromatic ring-containing methacrylate monomer (A) and the alkoxy group-containing acrylate (B) cooperate to contribute to achieving both appropriate physical properties and a glistening suppressing effect. Although details of such a mechanism are not clear, according to the studies conducted by the present inventors so far, the methacrylate-based polymerization component has a relatively high concentration in the vicinity of the surface of the polymerized product as compared with the acrylate-based polymerization component. It has been shown that it may exist (see, for example, WO 2019/138952). In addition, even a polymer generally called a hydrophobic acrylic polymer has many water-absorbing substances even if it is less than 1%, and a general-purpose intraocular lens is based on this slight water-absorbing property. It is considered that listening is occurring. In contrast, the aromatic ring-containing methacrylate (A) disclosed herein can exhibit high hydrophobicity similar to PMMA when polymerized at a high concentration. Therefore, according to the configuration disclosed herein, it is considered that the aromatic ring-containing methacrylate (A) is polymerized at a high concentration in the vicinity of the surface to form a hydrophobic surface, which effectively contributes to the reduction of glistening. To be Further, the alkoxy group-containing acrylate (B) and the hydroxy group-containing acrylate (C), which can have hydrophilicity, can be present in relatively high concentration in the vicinity of the center of the polymer, thereby reducing glistening on the surface of the polymer. It is believed that the polymer is imparted with good flexibility and shape recoverability while suppressing the above.

As the polymerizable aromatic ring-containing methacrylate (A), a compound containing at least one aromatic hydrocarbon group in its structure can be used. The methacrylate monomer containing an aromatic ring imparts a function of increasing the refractive index of the intraocular lens to the polymer. Examples of the aromatic hydrocarbon group include a benzene ring, a naphthalene ring, a biphenyl ring and a heterocycle. Examples of the heterocycle include a morpholine ring, a piperidine ring, a pyrrolidine ring and a piperazine ring. Specific examples of the aromatic ring-containing methacrylic monomer include benzyl methacrylate, phenyl methacrylate, o-phenylphenol methacrylate, phenoxy methacrylate, ethylene glycol phenyl ether methacrylate, diethylene glycol phenyl ether methacrylate, propylene glycol phenyl ether methacrylate, and ethylene oxide. Modified phenyl ring such as nonylphenol methacrylate, ethylene oxide modified cresol methacrylate, phenol ethylene oxide modified methacrylate, 2-hydroxy-3-phenoxypropyl methacrylate, methoxybenzyl methacrylate, chlorobenzyl methacrylate, cresyl methacrylate, and polystyryl methacrylate; hydroxy Examples thereof include those having a naphthalene ring such as ethylated β-naphthol methacrylate, 2-naphthoethyl methacrylate and 2-(4-methoxy-1-naphthoxy)ethyl methacrylate; those having a biphenyl ring such as biphenyl methacrylate. These aromatic ring-containing methacrylate monomers may be contained alone or in combination of two or more. The ratio of the polymerizable aromatic ring-containing methacrylate monomer in the (meth)acrylate copolymer is not limited to this, but for example, the ratio of the total of the four types of polymerization components (A) to (D) described above may be used. When it is 100 parts by mass, for example, it can be about 35 parts by mass or more, preferably about 40 parts by mass or more, and for example, about 42 parts by mass or more. The ratio of the aromatic ring-containing methacrylate monomer (A) can be, for example, about 55 parts by mass or less, preferably 52 parts by mass or less, and for example, about 50 parts by mass or less.

By the way, it is known that a polymer containing an aromatic ring-containing methacrylate monomer as a unit tends to have high hardness due to the large structure of the aromatic ring. Therefore, the aromatic ring-containing (meth)acrylic monomer is more preferably a methacrylate monomer having a relatively low glass transition point. As such an aromatic ring-containing methacrylate (A), among others, the following general formula (1):

It is preferable that the methacrylate monomer is However, in the formula, R1 represents a linear or branched alkylene group having 1 to 8 carbon atoms, and X represents an element not present (that is, a single bond) or an oxygen atom. Specific examples of the alkylene group include methylene group, ethylene group, n-propylene group, isopropylene group, cyclopropylene group, n-butylene group, isobutylene group, s-butylene group, t-butylene group, cyclobutylene. Group, n-pentylene group, 1-methyl-n-butylene group, 2-methyl-n-butylene group, 3-methyl-n-butylene group, 1,1-dimethyl-n-propylene group, 1,2-dimethyl It may be -n-propylene group, 2,2-dimethyl-n-propylene group, 1-ethyl-n-propylene group, cyclopentylene group, n-hexylene group and the like. From the viewpoint of reducing the water absorption of the polymer, X is more preferably a single bond. Preferred examples of such a methacrylate monomer component include benzyl methacrylate, phenylethyl methacrylate, ethylene glycol monophenyl ether methacrylate, diethylene glycol monophenyl ether methacrylate, and tetraethylene glycol monophenyl ether methacrylate.

The alkoxy group-containing acrylate (B) is, for example, an acrylate monomer component represented by the following formula: CH ₂ ═CHCOOR ₂ , wherein R ₂ is a functional group and/or a substituent containing an alkoxy group at least in part. It is a monomer. The alkoxy group is, for example, an alkoxy group having 1 to 5 carbon atoms (hereinafter referred to simply as “C _1-5 ”) or C _1-4 , typically C ₁ , C ₂ , C ₃ or the like. It is good to be a group. Specific examples thereof include a methoxy group, an ethoxy group, a propoxy group, a t-butoxy group, a pentyloxy group, an allyloxy group and the like, and a functional group partially containing these.

Specific examples of such an alkoxy group-containing acrylate include ethylene glycol monomethyl ether acrylate, ethylene glycol monoethyl ether acrylate, ethylene glycol monobutyl acrylate, diethylene glycol monomethyl ether acrylate, diethylene glycol monoethyl ether acrylate, and diethylene glycol monobutyl ether. Acrylate, dipropylene glycol methyl ether acrylate, dipropylene glycol ethyl ether acrylate, triethylene glycol monomethyl ether acrylate, triethylene glycol monoethyl ether acrylate, tetraethylene glycol monomethyl ether acrylate, tetraethylene glycol monoethyl ether acrylate, polyethylene glycol Examples thereof include alkoxy group-containing acrylates such as monomethyl ether acrylate, polyethylene glycol monoethyl ether acrylate, and 2-(2-ethylhexaoxy)ethyl acrylate. Preferably, the alkoxy group-containing acrylate (B) preferably contains, for example, an acrylate represented by the following general formula (2).

However, in the formula, R2 is a methyl group or an ethyl group, and n is an integer of 1 to 4. Examples of such compounds include ethoxy group monomethyl ether acrylate containing 1 to 4 ethoxy groups, ethoxy group monoethyl ether acrylate containing 1 to 4 ethoxy groups, and the like. Among them, ethylene glycol monomethyl ether acrylate (2-methoxyethyl acrylate: MEA), ethylene glycol monoethyl ether acrylate (2-ethoxyethyl acrylate: EEA), diethylene glycol monomethyl ether acrylate (2-(2-ethoxyethoxy)methyl acrylate: EEMA ) And diethylene glycol monoethyl ether acrylate (2-(2-ethoxyethoxy)emethyl acrylate: EEEA). These may include any one kind alone, or may include two or more kinds in combination. The proportion of the alkoxy group-containing acrylate (B) in the polymerization components may be about 30 parts by mass or more, for example, when the total of the four kinds of polymerization components (A) to (D) is 100 parts by mass. Yes, and preferably about 35 parts by weight or more, for example about 38 parts by weight or more. The proportion of the alkoxy group-containing acrylate (B) can be, for example, about 50 parts by mass or less, preferably 46 parts by mass or less, and for example, about 40 parts by mass or less.

The hydroxy group-containing acrylate (C) has a function of increasing the hydrophilicity of the (meth)acrylate copolymer, creating an environment in which aqueous humor does not easily aggregate in the voids of the copolymer, and suppressing generation of glistenings. The hydroxy group-containing acrylate (C) has the following general formula (3):

It is preferable to include a compound represented by However, in the formula, R3 is a linear or branched alkylene group having 1 to 8 carbon atoms. Examples of such a polymerization component include 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 6-hydroxyhexyl acrylate, 2,3-dihydroxypropyl acrylate, 8-hydroxyoctyl acrylate and the like. Can be mentioned. Among them, 2-hydroxyethyl acrylate (HEA), 4-hydroxybutyl acrylate (HBA) and the like are preferably used. These may include any one kind alone, or may include two or more kinds in combination.

The ratio of the hydroxy group-containing acrylate (C) in the (meth)acrylate copolymer is not strictly limited. For example, from the viewpoint of suitably suppressing the glistening of the intraocular lens, when the total of the four types of polymerization components (A) to (D) is 100 parts by mass, the hydroxy group-containing acrylate (C) The ratio can be, for example, about 5 parts by mass or more, preferably about 8 parts by mass or more, and for example, about 9 parts by mass or more. However, in the technique disclosed herein, since the aromatic ring-containing methacrylate monomer (A) and the alkoxy group-containing acrylate (B) suppress the occurrence of glistening under more relaxed conditions, It is preferable that the proportion of the hydroxy group-containing acrylate (C), which can greatly affect the physical properties such as the shape and water content of the inner lens, is small. From such a viewpoint, the proportion of the hydroxy group-containing acrylate (C) can be, for example, approximately 15 parts by mass or less (less than 15 parts by mass), preferably 12 parts by mass or less or 11.5 parts by mass or less, for example, about It may be 11 parts by mass or less.

The crosslinkable (meth)acrylate (D) may be a bifunctional (meth)acrylate or a trifunctional or higher functional poly(meth)acrylate. In the general polymer design, trifunctional to hexafunctional monomers are generally used for the purpose of introducing a crosslinking point. However, the more functional groups, the higher the hardness of the polymer. When introducing a crosslinking point in a soft intraocular lens material, it is preferable to use a bifunctional or trifunctional (meth)acrylate since it is required to have appropriate flexibility and high flexibility. Further, the crosslinkable (meth)acrylate (D) may have a configuration not containing a polyfunctional (meth)acrylate having four or more functional groups.

Specific examples of such a bifunctional (meth)acrylate include 1,3-butylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, and 1,6-hexanediol diacrylate. (Meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth) ) Acrylate, tetramethylene glycol di(meth)acrylate, ethylene oxide modified bisphenol A di(meth)acrylate, propylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, etc. Can be mentioned. Specific examples of the trifunctional (meth)acrylate include trimethylolpropane tri(meth)acrylate, tris(2-acryloyloxyethyl)isocyanurate, and ethylene oxide-modified trimethylolpropane tri(meth)acrylate. To be Among them, it is preferable to use any one of 1,3-butylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, and 1,6-hexanediol di(meth)acrylate. Although not limited to this, when the total amount of the crosslinkable (meth)acrylate (D) is 100% by mass, the crosslinkable acrylic monomer component is preferably about 50% by mass or more, and about 60% by mass. It is more preferably at least 70% by weight, for example, at least about 70% by weight, at least about 80% by weight, preferably at least about 90% by weight, for example, substantially 100% by weight. Thereby, the physical properties of the soft intraocular lens material can be stably improved.

The ratio of the crosslinkable (meth)acrylate (D) in the (meth)acrylate copolymer is not strictly limited. For example, from the viewpoint of suitably suppressing the glistening of the soft intraocular lens, when the total of the four types of polymerization components (A) to (D) is 100 parts by mass, the crosslinkable (meth)acrylate ( The ratio of D) can be, for example, about 1 part by mass or more, preferably about 3 parts by mass or more, and for example, about 4 parts by mass or more. However, an excessive amount of the crosslinkable (meth)acrylate (D) is not preferable because the hardness of the soft intraocular lens material may be too high. In this respect, the proportion of the crosslinkable (meth)acrylate (D) may be 10 parts by mass or less, preferably 10 parts by mass or less, more preferably 8 parts by mass or less, and for example, 5 parts by mass or less. ..

In the above-mentioned aromatic ring-containing methacrylate (A), alkoxy group-containing acrylate (B), hydroxy group-containing acrylate (C) and crosslinkable (meth)acrylate (D), a methacrylic monomer with respect to the total number M _A of acrylic monomers. When the total number of moles M _M of M _M /M _A is not limited to this, the value of M _M /M _A is preferably 0.2 or more, more preferably 0.4 or more. For example, it may be 0.5 or more. _The value of M M / _{M A} is preferably 1.2 or less, more preferably 1.1 or less, for example, it may be 1 or less.

Further, from the viewpoint of better exerting the effect of the combination of the aromatic ring-containing methacrylate (A) and the alkoxy group-containing acrylate (B), the total amount of the four types of polymerization components (A) to (D) is 100% by mass. The total amount of the aromatic ring-containing methacrylate (A) and the alkoxy group-containing acrylate (B) may be 75 parts by mass or more, 80 parts by mass or more is appropriate, 81 parts by mass or more, It may be 82 parts by mass or more, 83 parts by mass or more, or 85 parts by mass or more. In other words, the total amount of the hydroxy group-containing acrylate (C) and the crosslinkable (meth)acrylate (D) may be 25 parts by mass or less, 20 parts by mass or less is appropriate, 19 parts by mass or less, or 18 It may be less than or equal to 17 parts by mass, or less than or equal to 15 parts by mass.

However, considering the content of the hydrophilic monomer component or the crosslinkable monomer component, the total amount of the aromatic ring-containing methacrylate (A) and the alkoxy group-containing acrylate (B) is 90 parts by mass or less, for example, 89 parts by mass or less, It is preferable to keep the amount to about 88 parts by mass or less. In other words, the total amount of the hydroxy group-containing acrylate (C) and the crosslinkable (meth)acrylate (D) may be 10 parts by mass or more, for example, 11 parts by mass or more, or 12 parts by mass or more. Accordingly, the soft intraocular lens material having a simpler configuration makes it possible to realize a soft intraocular lens in which physical properties and low glistening properties are compatible at a high level.

Further, the (meth)acrylate copolymer constituting the soft intraocular lens material may include a polymerization component corresponding to a constitutional unit other than the above, as long as the essence of the technology disclosed herein is not impaired.

As other polymerization components, for example, aromatic ring-containing acrylates and alkoxy group-containing acrylates corresponding to the above-mentioned aromatic ring-containing methacrylate (A), alkoxy group-containing acrylate (B) and hydroxy group-containing acrylate (C), respectively. It may be a methacrylate and a hydroxy group-containing methacrylate. However, since these polymerization components may impair the balance of the above-mentioned polymerization components (A) to (C), the corresponding aromatic ring-containing methacrylate (A), alkoxy group-containing acrylate (B), and hydroxy group-containing acrylate. It is preferable that the proportion is 10% by mass or less, preferably 5% by mass or less, for example, 3% by mass or less, relative to (C). It is preferable that the aromatic ring-containing acrylate, the alkoxy group-containing methacrylate, and the hydroxy group-containing methacrylate are not included.

Furthermore, examples of the other polymerization component include a monomer represented by the following formula: CH ₂ ═C(R ¹ )COOR ² . Here, R ¹ in the above formula is a hydrogen atom (H) or a methyl group (CH ₃ ). R ² in the above formula is a linear, branched or cyclic hydrocarbon group having 1 to 20 carbon atoms (C1 to 20). From the viewpoint of imparting flexibility, it is preferable that R ² contains an alkyl(meth)acrylate which is, for example, a C1-12, typically C1-10, preferably C2-8, for example C3-5 alkyl group. Specific examples of such alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate and tert-butyl (meth)acrylate. Acrylate, isobutyl (meth)acrylate, n-pentyl (meth)acrylate, tert-pentyl (meth)acrylate, hexyl (meth)acrylate, 2-methylbutyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth) Linear such as acrylate, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, stearyl (meth)acrylate, cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate , Branched chain, and cyclic alkyl (meth)acrylates. These alkyl (meth)acrylates may be contained alone or in combination of two or more.

Excessive inclusion of the alkyl (meth)acrylate component is not preferable because it may impair the balance of the above-mentioned polymerization components (A) to (C). Therefore, when the alkyl (meth)acrylate component is included, it is considered appropriate that the amount of the polymerization component is about 10 parts by mass when the total amount of the polymerization component is 100 parts by mass. The proportion of the alkyl (meth)acrylate component is typically about 5 parts by mass or less, for example, 3 parts by mass or less, and 1 part by mass or less, for example, a configuration that does not substantially include is more suitable.

Further, as another polymerization component, it is possible to include an ultraviolet absorption monomer component having an ultraviolet absorption ability and having a copolymerizability with the above-mentioned polymerization components (A) to (D). The crystalline lens has a property of not easily transmitting ultraviolet rays, whereas the soft intraocular lens can transmit ultraviolet rays, and thus there is a risk of damaging the retina. Therefore, by including an ultraviolet absorbing monomer component having an ultraviolet absorbing ability as the sub-monomer component, the ultraviolet absorbing ability can be imparted to the (meth)acrylate copolymer constituting the soft intraocular lens 1. This makes it possible to suppress damage to the retina and reduce the risk of UV-induced eye diseases such as macular degeneration and keratitis. In addition, "ultraviolet absorbing monomer" means all monomers having a functional group having an ultraviolet absorbing ability. Further, the functional group having an ultraviolet absorbing ability means a group of functional atomic groups having an absorption spectrum in the ultraviolet region. Such a functional group having an ultraviolet absorbing ability may be a generic term for an alkyl residue, a carboxylic acid residue, an alcohol residue, an amino residue, an acyl group, etc. of an ultraviolet absorbing compound which is widely used as an ultraviolet absorber. In one example, the ultraviolet absorbing functional group broadly includes an atomic group obtained by removing a hydrogen atom from a carboxyl group, a hydroxyl group, an amino group or the like in an ultraviolet absorbing compound, an acyl group in the ultraviolet absorbing compound, or the like. More specifically, a benzotriazole-based monomer component, a benzophenone-based monomer component, a salicylic acid-based monomer component, and a cyanoacrylate-based monomer component can be preferably used as the ultraviolet absorbing monomer component.

It is considered appropriate that the UV-absorbing monomer component is contained in a proportion of about 0.1 to 1 part by mass when the total amount of the polymerizing components is 100 parts by mass. This is because if the proportion of the UV-absorbing monomer component is too low than 0.1% by mass, the UV-absorbing ability of the soft intraocular lens 1 may be too low to function effectively. If the proportion of the ultraviolet absorbing monomer component is more than 1% by mass, the soft intraocular lens 1 may be discolored due to a change in physical properties or a change with time. The ratio of the ultraviolet absorbing monomer component is typically about 0.15 to 0.7% by mass, and more preferably about 0.2 to 0.5% by mass.

Also, since the lens has a yellowish tint, it has the property of partially suppressing the transmission of the opposite color, blue light. Therefore, it is preferable that the (meth)acrylate copolymer disclosed herein is also colored with a yellow dye or a red dye to adjust the color vision. As such a colorant, a known azo compound, a pyrazole compound or the like which has copolymerizability with the above-mentioned (meth)acrylate monomer component and is used as a colorant for this kind of soft intraocular lens is used. It can be used as appropriate. The blending amount of these can be appropriately determined from the relationship with the above-mentioned polymerization components. For example, it may be contained in an amount of about 0.001 to 0.1 parts by mass with respect to 100 parts by mass of the polymerization component.

Other examples of the compound used to form the (meth)acrylate copolymer include a polymerization initiator. As the polymerization initiator, for example, a radical polymerization initiator composed of benzoin ethers or amines can be preferably used. As an example, specifically, a polymerization initiator represented by 2,2-azobisisobutyronitrile, azobisdimethylvaleronitrile, benzoin, methylorthobenzoylbenzoate, or the like can be used. The blending amount of these can be appropriately determined from the relationship with the above-mentioned polymerization components. For example, it may be contained in an amount of about 0.01 to 1 part by mass with respect to 100 parts by mass of the polymerizing component.

The method for obtaining the soft intraocular lens material is not particularly limited, and as a method for synthesizing a known (meth)acrylate copolymer, such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a suspension polymerization method, or a photopolymerization method. Various known polymerization methods can be appropriately adopted. Among them, for example, a solution polymerization method in which a mixed monomer composition in which the above-mentioned polymerization components are appropriately mixed is polymerized can be preferably used. For manufacturing the soft intraocular lens 1, a conventionally known manufacturing method such as a so-called cast molding method or lathe cutting method can be appropriately adopted. For example, in the cast mold manufacturing method, specifically, a mold having a cavity (void) corresponding to the shape of the target soft intraocular lens 1 is prepared, and the raw material composition (raw material monomer solution) is supplied to the mold. The raw material composition may be polymerized in the mold. For example, in the cutting method, specifically, the mixed monomer composition corresponding to the composition of the target soft intraocular lens 1 is polymerized into a sheet shape (including a plate shape, etc.), and the polymerized sheet-shaped soft eye is formed. The inner lens material may be cut into a soft intraocular lens having a desired shape. The cutting may be performed by freezing a sheet-shaped soft intraocular lens material.

The soft intraocular lens material disclosed herein has significantly reduced the occurrence of glistenings. For example, when artificially generating glistenings, the number and area of bright spots observed with a microscope are reduced. For example, as conditions for artificially generating glistenings, it is possible to keep the temperature at 60° C. in a wet state and then change the temperature to 25° C.

The wet state can be understood as a state in which the soft intraocular lens material is immersed in pure water. By dipping the soft intraocular lens material in pure water instead of physiological saline or the like, glistening can be generated in a shorter time. In the present specification, ultrapure water having an electric resistivity of 15 MΩ·cm or more at 25° C. or an electric conductivity of 0.058 μS/cm or less is preferably used as pure water. The holding time of the lens material in a high temperature environment of 60° C. can be about 2 hours, for example. As a result, water can be sufficiently absorbed while the polymer structure of the lens material is relaxed. In other words, the lens material can absorb supersaturated water.

Then, the temperature of this soft intraocular lens material is changed (cooled) to 25°C. As a result, the polymer structure of the lens material is shrunk (the water absorption rate is lowered), and the water left in the polymer structure in the room temperature environment is aggregated in the minute gaps. In order to stabilize the polymer structure after cooling and the state of occurrence of glistening, the lens material after cooling may be kept at 25° C. for about 24 hours. As a result, glistening can be acceleratedly generated.
It should be noted that the temperature conditions of “60° C.” and “25° C.”, which are the temperature conditions for the occurrence of glistening, can be allowed a fluctuation or error of about ±2° C.

At this time, in the conventional soft intraocular lens material, it is confirmed that the entire lens material becomes cloudy or that bright spots are significantly generated over the entire lens material. The number of bright spots of glistening confirmed by microscope observation for the conventional soft intraocular lens material can be, for example, 1000/mm ² or more per unit area. Also, for example, the area of glistenings found in lens material having a diameter of about 6 mm can be greater than 0.05 mm ² . On the other hand, in the soft intraocular lens material disclosed herein, in addition to the hydrophilic acrylate, the combination of the aromatic ring-containing methacrylate (A) and the alkoxy group-containing acrylate (B) preferably suppresses glistening. As a result, the number of bright spots of glistening per unit area by microscopic observation is suppressed to 400 pieces/mm ² or less. Further, for example, the area of glistenings is confirmed lens material having a diameter of about 6 mm, 0.05 mm ² or less (e.g., 0.045 mm ² or less, more 0.043 mm ² or less) may be.

In addition, the soft intraocular lens material disclosed herein can be moderately flexibly adjusted without being too soft or too hard, that is, the international rubber hardness is 40 or more and 60 or less, which is optimal for folding the lens. Such appropriate flexibility is also realized by an appropriate combination of the aromatic ring-containing methacrylate (A) and the alkoxy group-containing acrylate (B). Thereby, the soft intraocular lens material disclosed herein, while maintaining an appropriate flexibility, the occurrence of glistening is suppressed, the flexibility and glistening resistance are compatible, a new soft eye. It can be said that it is an inner lens material.

In addition, since the soft intraocular lens 1 disclosed herein is composed of the (meth)acrylate copolymer having the above-mentioned configuration, the foldable flexibility and the elastic restoring force are the same as those of the conventional soft intraocular lens. It is preferably provided similarly to the lens. The soft intraocular lens 1 disclosed herein is further reduced in occurrence of glistenings. From this, it can be said that the soft intraocular lens 1 has excellent affinity in the living environment. Further, the soft intraocular lens 1 is restored to its original shape when it is folded into a small size and when it is unfolded as soon as the folding force is released. As a result, the soft intraocular lens 1 disclosed herein can be particularly suitably used as a soft intraocular lens in which the soft intraocular lens 1 is slightly bent by a dedicated insertion tool and inserted into the eye. From this point of view, the technology disclosed herein can preferably provide this intraocular lens insertion system.

Although not specifically shown, the intraocular lens insertion system includes the soft intraocular lens 1 described above and an injector. The injector has, for example, a syringe-type injector body and a plunger. The width of the internal space of the injector main body is reduced on the distal end side, and the soft intraocular lens 1 is configured to be folded in the width direction by passing through the internal space. The soft intraocular lens 1 is preset inside the injector body in a flat state. When inserting the soft intraocular lens 1 into the capsule or the like, a lubricant or the like made of a viscoelastic substance or the like is supplied to the injector body, and then the plunger is pushed into the injector body. As a result, the soft intraocular lens 1 is bent so as to be folded, and the soft intraocular lens 1 is discharged to the outside through the discharge port at the tip of the injector together with the lubricant. This allows the soft intraocular lens 1 to be easily inserted into the lens capsule of the eyeball. It should be noted that the injector may be composed of, for example, only the cartridge portion that is the portion from the housing portion that houses the soft intraocular lens 1 to the ejection port that ejects the soft intraocular lens 1 in the injector body. Good. The cartridge unit may be configured to be attachable to and detachable from the injector body, for example.

Hereinafter, some examples of the present invention will be described, but the present invention is not intended to be limited to the specific examples.

As a polymerization component, the following polymerizable monomers were prepared in a composition shown in Table 1, and a polymerization initiator was added and mixed uniformly to obtain a raw material composition for intraocular lenses of Examples 1 to 19 and Comparative Examples 1 to 13. I prepared things. The raw material compositions of Examples 11 to 13 and Comparative Examples 11 and 13 contained two kinds of alkoxy group-containing acrylates (B), but the raw material compositions of the other examples were aromatic ring-containing methacrylate (A). , An alkoxy group-containing acrylate (B), a hydrophilic monomer (C), and a crosslinkable monomer (D). Then, this raw material composition was poured into a mold provided with a biconvex lens type piloty and a mold (flat plate), respectively, and polymerized under the conditions of 60° C. for 12 hours and 100° C. for 12 hours. As a result, first, a soft lens molded body for glistening evaluation of each example was obtained. The flat polymer was cut into a 1.5 cm square and a thickness of 1 mm to obtain an intraocular lens material for the evaluation of international rubber hardness in each example.

The following six types were prepared as the aromatic ring-containing monomer.
BZMA: benzyl methacrylate EGPEMA: ethylene glycol monophenyl ether methacrylate EGPEA: ethylene glycol monophenyl ether acrylate PEMA: phenylethyl methacrylate PEA: phenylethyl acrylate

The following seven types were prepared as the aromatic ring-free monomers.
MEA: 2-methoxyethyl acrylate EEEA: 2-(2-ethoxyethoxy)ethyl acrylate MEMA: 2-methoxyethyl methacrylate EEMA: 2-ethoxyethyl methacrylate EA: n-ethyl acrylate BA: n-butyl acrylate BMA: n-butyl Methacrylate

The following three types were prepared as hydrophilic monomers.
HBA: 4-Hydroxybutyl acrylate HEA: 2-Hydroxyethyl acrylate HEMA: 2-Hydroxyethyl methacrylate The following three types of crosslinkable monomers were prepared.
BDDA: 1,4-butanediol diacrylate NDDA: 1,9-nonanediol diacrylate TMPTA: trimethylolpropane triacrylate

[IRHD measurement]
The international rubber hardness (IRHD) of the intraocular lens material for evaluation (1.5 cm square) of each example was measured. As the durometer, GS-680sel (type A durometer specified in JIS K6253:2012) manufactured by Teclock Co., Ltd. is used, and it is subjected to the M method (medium size micro size test) of ISO48:2010 (JIS K6253-2). The plane hardness was measured accordingly. International rubber hardness is measured by acclimatizing the soft lens molding of each example in a test environment of temperature: 21 to 23°C, humidity: 30 to 70% RH for 1 hour or more, and then the number of tests: n = 5 It was carried out by measuring the rubber hardness. An arithmetic mean value was calculated from the obtained international rubber hardness and shown in the relevant column of Table 1 below. The lower limit of IRHD is "30", and hardness less than IRHD30 cannot be measured.

[Evaluation of glistening suppression]
For the evaluation soft lens molded body of each example, after the glistening is generated in an accelerated manner, the number and area of bright spots of the glistening are calculated by performing microscope observation and image analysis, and the glistening characteristics are calculated. evaluated. The soft lens molded body has an optical portion with a diameter of about 6 mm and a thickness of 0.6 mm, and is provided with a pair of supporting portions on the periphery thereof. The acceleration condition for the occurrence of glistening is that the soft lens molding of each example is immersed in ultrapure water, held for 2 hours in a heating environment of 60° C., and then allowed to stand at room temperature for 24 hours. did. This is because in a humid environment simulating the inside of a capsule, the water absorption rate of the lens molded body is drastically reduced by imparting a rapid temperature change from a high temperature to a low temperature to the lens molded body, and water is locally absorbed in the polymer structure. It creates a situation where is left behind. As the ultrapure water, ultrapure water (usually 18 MΩ·cm or more) whose electric resistivity is controlled to 16 MΩ·cm or more (25° C.) was used. The room temperature environment is controlled at 25±2°C.

For microscope observation, a stereo microscope SMZ1500 manufactured by Nikon Corporation and a digital camera DS-Vi1 manufactured by Nikon Corporation are used, and these are controlled by using image integration software NIS-Elements, thereby providing a soft evaluation. A plane image (800×600 pixels) of the lens molded body was acquired. The observation field of view was set so that the bent portions of the support portion of the soft lens molded body were diagonally arranged in the image, and the optical portion was largely arranged over the entire surface of the image. ImageJ developed by National Institutes of Health (NIH) was used for image analysis.

The observation conditions of the stereoscopic microscope are as follows.
Mode setting: Manual exposure Exposure time: 30m/s
Gain: 1.00x
Contrast setting: Standard lighting: Dark field (maximum light intensity)
Light control dial: maximum light intensity Magnification: 15 times (objective lens 1x, eyepiece lens 10x, zoom 1.5x)

The number of bright spots and the area of bright spots were calculated by image analysis according to the following procedure.
First, convert the image into 8-bit grayscale by importing the imaged flat image of the molded soft lens into Image J and performing "8-bit" processing of the Type (image type) submenu of the Image (image) menu. did. Then, in the Adjust (correction) submenu, by adjusting the upper limit of the Threshold level to 255 and the lower limit to 40, a binary value that converts pixels in the threshold range of the image into black and other pixels into white Was made. As a result, the image of the soft lens molded body is binarized so that the outline and the bright points are approximately black and the other portions are white. After that, using the ellipse area selection tool button in the Image (image) menu, select the area (inside the contour) of the optical part of the binarized soft lens molding image to create an analysis area (Create Selection) did.

Next, by using the Analyze Particles sub-menu of the Analyze menu, the number and area of objects (black dots indicating bright spots) in the selected area were measured. The number of particles (particle count) calculated from this submenu was taken as the number of bright spots, and the total particle area (total particle area) was taken as the total area of bright spots.

Then, the glistening suppression effect was evaluated from the obtained number and area of bright spots based on the index shown in Table 2 below, and the result is shown in the column of "sensory evaluation" in Table 2. Since the total particle area is displayed in pixel units, the total area was converted to mm ² units from the relationship of 1 mm=about 96 pixels obtained from the magnification of the image. For reference, the calculation result of the total area is shown in Table 1.

[Evaluation]
From the above evaluation results of IRHD and glistening suppression, the soft intraocular lens material having an IRHD of 40 or more and 60 or less and a sensory evaluation result of glistening of A was used for appropriate mechanical properties such as flexibility. The product is evaluated as a good product (OK) having the effect of suppressing the glistening, and the case where the IRHD is less than 40 or more than 60 or the result of the sensory evaluation of the glistening is B or C is regarded as a defective product (NG), and the result is obtained. Is shown in the "Evaluation" column of Table 1.

As shown in Table 1, Examples 1 to 10 include BZMA which is an aromatic ring-containing methacrylic monomer, MEA which is an aromatic ring-free alkoxy group-containing acrylic monomer, and HBA which is a hydrophilic acrylic monomer. This is an example in which BDDA, which is a crosslinkable acrylic monomer, is used in combination and the composition thereof is variously changed. It has been confirmed that by using such a combination of monomers, it is possible to obtain a soft intraocular lens material having both appropriate physical properties and a glistening suppressing effect. In addition, it was confirmed that good characteristics are realized regardless of whether the main component (maximum component) of the main polymerization components is BZMA, which is an aromatic ring-containing monomer, or MEA, which is a non-aromatic ring-containing monomer. did it. Further, as can be seen from the comparison of Examples 6 to 8 and the like, in a system in which the main polymerization components are an aromatic ring-containing methacrylic monomer and an aromatic ring-free alkoxy group-containing acrylic monomer, the glistening does not always involve hydrophilic monomers. It was confirmed that the higher the content of, the more the content was not reduced. It can be seen that the preferable combination of the aromatic ring-containing methacrylic monomer and the aromatic ring-free alkoxy group-containing acrylic monomer also contributes to the reduction of glistening.

However, as shown in Comparative Example 1, when the total amount of the polymerization components is 100 parts by mass and the MEA which is an acrylic monomer in the main polymerization components is less than 30 parts by mass, IRHD exceeds 60. It was confirmed that the polymer may become too hard in some cases. It can be said that it is desirable to account for 30 parts by mass or more of the softer acrylic component among the main polymerization components.

On the other hand, the HBA used as the hydrophilic monomer is changed to HEA in Example 11 and HEMA in Comparative Example 2. In Example 11 in which HEA, which is the same acrylic monomer component as HBA, was used as the hydrophilic monomer, a soft intraocular lens material having both appropriate flexibility and a glistening suppression effect was obtained as in Examples 1-10. I found out that However, in Comparative Example 2 in which HEMA that is a methacrylic monomer component was used as the hydrophilic monomer, the result was that glistening abnormally occurred. This is considered to be because the presence of the hydrophilic methacrylic monomer component on the surface of the polymer did not favorably form the hydrophobic surface of BZMA and could not successfully suppress glistening. In a system in which an aromatic ring-containing methacrylic monomer and an aromatic ring-free alkoxy group-containing acrylic monomer are used as main and secondary synthetic components, when a methacrylic monomer is mixed as a hydrophilic monomer, the occurrence of glistening cannot be suppressed appropriately. all right.

Further, as the crosslinkable monomer, NDDA having a large number of carbon atoms is used in Example 12 and trifunctional TMPTA is used in Example 13 in place of BDDA having a small number of carbon atoms and bifunctional. Regarding the crosslinkable monomer, even when the number of functional groups, the length of the monomer chain, and the like were changed, the flexibility of the soft intraocular lens material and the effect of suppressing glistening were not significantly changed. It has been found that various kinds of crosslinkable monomers can be used in combination with the above-mentioned polymerizable monomers without being limited in kind.

Further, in Example 14 and Comparative Examples 3 to 6, in place of MEA, which is the aromatic ring-free alkoxy group-containing acrylic monomer, in Example 14, the same aromatic ring-free alkoxy group-containing acrylic monomer EEEA was used. In Comparative Examples 3 to 4, MEMA and EEMA, which are the same methacrylates, are used, and in Comparative Examples 5 to 6, BA and BMA, which are alkyl group-containing (meth)acrylate monomers, are used. It was found that in Example 14 using EEEA, which is the same alkoxy acrylate monomer component as MEA, it is possible to obtain a soft intraocular lens material having both appropriate flexibility and a glistening suppressing effect, as in Examples 1 to 10. It was However, in Comparative Examples 3 and 4 using MEMA and EEMA which are alkoxymethacrylate monomers instead of the alkoxyacrylate monomer, and Comparative Example 6 which uses BMA which is an alkylmethacrylate monomer, IRHD is significantly increased and the soft eye It was confirmed that the flexibility of the inner lens material was lost. On the other hand, in Comparative Example 5 using the alkyl acrylate monomer, it was found that although the flexibility was good, the occurrence of glistenings could not be suppressed appropriately.

As shown in Examples 15 to 17, the same effect can be obtained even if two or more different monomer components such as MEA and EEEA are used in combination as long as they are acrylic monomers containing no aromatic ring and containing an alkoxy group. It was confirmed that it was obtained.
From these, it was confirmed that whether the monomer component was acrylate or methacrylate had a great influence on the physical properties and glistening properties of the polymer formed.

Then, in Examples 18 to 19 and Comparative Examples 7 to 8, instead of BZMA, which is an aromatic ring-containing methacrylate, in Example 18 and Comparative Example 7, EGPEMA and EGPEA were used, and in Example 19 and Comparative Example 8, PEMA and PEA are used respectively. In Examples 18 to 19 using EPGEMA or PEMA which is an aromatic ring-containing methacrylate, it was found that a soft intraocular lens material having both excellent physical properties and a glistening suppressing effect was obtained. However, in Comparative Examples 7 to 8 using these acrylates EGPEA and PEA, the polymers obtained were too soft, and the IRHD could not be measured. It has been found that when the aromatic ring-containing monomer to be combined with the aromatic ring-free alkoxy group-containing acrylic monomer is not a methacrylic monomer, it becomes difficult to handle the soft intraocular lens material.

As described above, it can be seen that the properties of the obtained soft intraocular lens material greatly change depending on whether each monomer component is an acrylate monomer or a methacrylate monomer. Here, in Comparative Examples 9 to 13, combinations of the aromatic ring-containing monomer, the aromatic ring-free monomer, the hydrophilic monomer and the crosslinkable monomer with acrylate and methacrylate were variously changed. As a result, for example, when EGPEA was used as the aromatic ring-containing monomer, as shown in Comparative Examples 9 to 11 and 13, any of EA, EEMA, and combinations thereof were used as the aromatic ring-free monomer. However, the IRHD tends to be a low value of less than 40, and although the flexibility of the soft intraocular lens is high, it takes time to recover the shape of the folded lens in the capsule, or the shape cannot be recovered completely. It was confirmed that there was a risk. At the same time, there is a concern that the lens is likely to be damaged when it is ejected from the injector. Regarding the soft intraocular lens of Comparative Example 12, although IRHD was appropriate at 40, it was found that glistening was likely to occur and physical properties and low glistening properties were not compatible. From the above, it was found that even if the combination of monomers used was slightly different, the balance of the IRHD and/or glistening suppression effect was lost, and a high quality soft intraocular lens material was not provided. From these things, in the technique disclosed here, a soft intraocular lens material is constituted by combining an aromatic ring-containing methacrylic monomer, an aromatic ring-free alkoxy group-containing acrylic monomer, and a hydrophilic acrylic monomer. Was confirmed to be essential.

The specific examples of the present invention have been described above in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

1 Intraocular lens 10 Optical part 20 Support part 20a Bending part

Claims

A soft intraocular lens material obtained by polymerizing a polymerizable component having a polymerizable property,
The polymerization component is
Aromatic ring-containing methacrylate (A),
An alkoxy group-containing acrylate (B),
A hydroxy group-containing acrylate (C),
A crosslinkable (meth)acrylate (D),
Including,
A soft intraocular lens material in which the ratio of the alkoxy group-containing acrylate (B) is 30 parts by mass or more when the polymerization component is 100 parts by mass.
The soft intraocular lens material according to claim 1, wherein the aromatic ring-containing methacrylate (A) is 40 parts by mass or more and 52 parts by mass or less when the polymerization component is 100 parts by mass.
The soft intraocular lens material according to claim 1 or 2, wherein the alkoxy group-containing acrylate (B) is 35 parts by mass or more and 46 parts by mass or less when the polymerization component is 100 parts by mass.
The soft intraocular lens material according to any one of claims 1 to 3, wherein the hydroxy group-containing acrylate (C) is 8 parts by mass or more and 12 parts by mass or less when the polymerization component is 100 parts by mass. ..
The total amount of the aromatic ring-containing methacrylate (A) and the alkoxy group-containing acrylate (B) is 75 parts by mass or more and 90 parts by mass or less, when the polymerization component is 100 parts by mass. 4. The soft intraocular lens material according to any one of 4 above.
The aromatic ring-containing methacrylate (A) has the following general formula (1):

However, in the formula, R1 represents a linear or branched alkylene group having 1 to 8 carbon atoms, and X represents the absence of an element or an oxygen atom; Item 6. The soft intraocular lens material according to any one of items 1 to 5.
The alkoxy group-containing acrylate (B) has the following general formula (2):

However, in the formula, R2 is a methyl group or an ethyl group, and n is an integer of 1 to 4; The soft intraocular lens according to any one of claims 1 to 5, including an acrylate represented by material.
The hydroxy group-containing acrylate (C) has the following general formula (3):

However, in the formula, R3 is a linear or branched alkylene group having 1 to 8 carbon atoms; and the soft intraocular body according to any one of claims 1 to 7 containing an acrylate represented by Lens material.
The soft intraocular lens material according to any one of claims 1 to 8, wherein the polymerized component contains a monomer having an ultraviolet absorbing ability.
The soft intraocular lens material according to any one of claims 1 to 9, wherein the polymerization component contains a monomer having a yellow coloring ability.
A soft intraocular lens manufactured using the intraocular lens material according to any one of claims 1 to 10.